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Thanks, I'll have look. The main purpose is to have this software running on the average user's machine. I'll have look to see if I can bundle it and put a minimal gui on top.
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George ProfenzaNov 29 '12 at 21:45

If you want GUI you might want to check VLC, it's using some of the same libraries too
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BenjaminNov 29 '12 at 23:04

For a good GUI based on libavcodec (which a ffmpeg library), take a look at handbrake. Might be a bit too detailed for a very "simple" user, but with some effort it's manegable. It also supports saving of presets, so you can set it up for easy use.